docs: def load_data(self, data, offset):
          """
          Ask YubiHSM to load arbitrary data into it's internal buffer, at any offset.
  
          The data is stored internally in the YubiHSM in temporary memory -
          this operation would typically be followed by one or more L{generate_aead}
          commands to actually retreive the generated secret (in encrypted form).
  
          Load data to offset 0 to reset the buffer.
  
          @param data: arbitrary data to load
          @type data: string
  
          @returns: Number of bytes in YubiHSM internal buffer after load
          @rtype: integer
  
          @see: L{pyhsm.buffer_cmd.YHSM_Cmd_Buffer_Load}
          """
          return pyhsm.buffer_cmd.YHSM_Cmd_Buffer_Load(self.stick, data, offset).execute()